Mineral-oil vacuum still



May 15, '1928.

A. E. PEw, JR

MINERAL OIL VACUUM STILL Ori ...owbk

Patented w15,

PATENT oFFlcE.

An'rnnn n. raw, 31,01 BnYN nAwn, PENNSYLVANIA, AssIeNon 'ro sUN on. oon- 2mg or rmLAnELrnIA, PENNSYLVANIA. A conronArIoN or NEW. JERSEY.

xrNnnAL-ou. vAcUt'm serum.

Utlginal application ild June 19, 1926f8eria1 No', 38,154. vivieli and this application nled February l f. r 27,1926. Serin No. 91,046. s 4

In 'an vapplication filed b me June v19,

1925, Serial No.' 38,184 ofw 'ch this appli` cation is a division, I`set forth an apparatus for the continuous distillation of oil under 'a high 'vacuum'. Included in the apparatus.

is a series of stills. The oil in each of-these stills is undera highvacuum. It essential that there shall be no leakage whatever from;

the stills, or from anyother art-of the sys- 10 tem through which the oil an tle oil vapors circulate. It is, however, necessary'to rovide means for accessto the interior o the lsystem', and. particularly yto theinteriors. of

the stills when-the plant is shut down.

' 15. Again, in case any of the stills is provided with a partition, itmay-be desirable or' necessary lto allow access through 'the artition from one end chamber of the sttothe other. The provision of manholes in the go end heads and vin the partitions a simple and obvious matter, butto hermetical-ly seal the manhole covers during operation is a dlficult problem. The ob]ect of the present t invention is to provide means Wherebyfwhen g5 the cover is applied to the manhole, the still, stilll chamber or other container will be sealedagainst air leakage.

A pre is shownin the accompanying drawings, in

ifg which-'- Fi .-1 is a longitudinal section through a still aving a' central transverse artxtion and equipped, with manholesan covers therefor.

Fig. 2 is a detail .sectional view through' a m'anhole and its cover and showing proved sealing means.

my im- Thel still comprises a cylindrical body qj I and end heads b and'isprovided with suit- 'ya' able 'internal reinforcements c' to prevent f lhermetically erred embodiment of the 'invention lvania on this 19th da -of 'collapse' of the still lunder'external atmospherlc pressure. These reinforcements need not be. erein particularly described, as they form no part of the resent invent-ion. i

plate d is secured by means ofa bolt g and 50' nut h., The ringe is provided with an annular groove z' into which extends an annular pro'ection j on the cover plate d. lBetween t e iprojection and the groove is confined a so copper gasket lc, which affords 55 an air-tight seal.

If the tank is provided with a partition m, the latter should be provided with stiftening bars n and with a man-hole o, which may be closed by a cover'plate p, the latter being 4mv p sealed in thesame manner as cover plate d.

WhatIclaim is: The combinationwith a vacuum still hav- I inga manhole, the still wall `around the margin of the-hole, l

-a cover overlying the ring member and the hole, an annular rib lon one member en agmg an annular groove on the other mem er, said rib and groove beingdistant from the 'lo inner and outer edges of the ring member, a soft metal gasket confined between said rib and roovej, and 'bolts sitioned between said rib and `groove and t e outer peripheralA edges of both members and leach extending 76 through both members and the still wall. In` testimony ofwhich invention, I have hereunto set my hand at Philadelphia, Penn February, 1926'. E. PEW,'Jn.

of a ring member secured to 65 

